Materials Literature
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In Reih' und Glied: Durch Konvektion werden in klaren, nichtviskosen verdünnten Lösungen supramolekulare Aggregate gebildet (siehe Bild). Die Ausrichtung erzeugt einen Lineardichroismus, der zu Artefakten in Circulardichroismusmessungen führt.
Mucoadhesive polymeric films have been prepared based on blends of chitosan and hydroxyethylcellulose. The blends have been characterized by IR spectroscopy, DSC, WAXD, TGA, SEM, and mechanical testing. It is demonstrated that the mechanical properties of chitosan are improved significantly upon blending with hydroxye…
The primary objective of this study was to evaluate epicardial transplantation of an intact microvascular network for treatment of myocardial ischemia in a murine model of acute myocardial infarction. We describe transplantation of an intact microvascular network constructed from isolated microvascular segments stabil…
Abstract The transitions and reactions involved in the thermal treatment of several commercial azodicarbonamides (ADC) in an inert atmosphere have been studied by dynamic thermogravimetry analysis (TGA), mass spectrometry and Fourier transform infrared (FTIR) spectroscopy. A pseudo‐mechanistic model, involving several…
We report a systematic density functional theory investigation of adsorption of small Au n ( n =1–6) clusters on ideal and defected MgO(100) single crystal surfaces and Mo(100) supported thin MgO(100) films. As a model defect, we consider a neutral surface oxygen vacancy ( F s ). Optimal adsorption geometries and ener…
The quest to understand the condensation of proteins from solutions is a rapidly evolving field. The purpose of this book is to bring to an interdisciplinary audience the state-of-the-art in current research. The first part of the book deals with issues related to the production of high quality protein crystals from s…
Self-assembly is the mechanism that controls the formation of well-defined structures from disordered pre-existing parts. Despite the importance of self-assembly as a manufacturing method and the increasingly large number of experimental realizations of complex self-assembled nano-aggregates, theoretical predictions a…
Polymer nanotubes have been successfully electrospun via a single capillary spinneret instead of coaxial electrospinning. By altering the volume of ethanol under a fixed amount of poly(vinyl pyrrolidone) (PVP) and tetraethyl orthosilicate (TEOS) in the precursor, the nanotubes could be controllably produced for a prop…
Self-assembly of AB diblock copolymers confined in cylindrical nanopores is studied using a simulated annealing technique. The pore diameter and surface preference are systematically varied to examine their effects on the self-assembled morphologies and the chain conformations. For bulk lamella-forming and cylinder-fo…
Dopant-induced helical conformations of polyaniline (PANI) nanofibers are presented. Right- and left-handed helical nanofibers of conducting PANI are produced using respectively D- and L-camphorsulfonic acid as the dopant, it is reported, as proved by the mirror-image chiral dichroism spectra (see figure). The authors…
Abstract The attachment of water molecules to poly(vinylpyrrolidone) (PVP) is used in conjunction with the region‐selective distribution of PVP and water in a water/PVP/ n ‐pentanol system to confine reactions along the surface of PVP, thus achieving the highly shape‐selective synthesis of anisotropic Au nanostructure…
Magnetic domain wall motion induced by magnetic fields and spin-polarized electrical currents is experimentally well established. A full understanding of the underlying mechanisms, however, remains elusive. For the ferromagnetic semiconductor (Ga,Mn)As, we have measured and compared such motions in the thermally activ…
Slow reduction of platinum salt in soft template made by direct hexagonal mesophases leads to Pt nanoballs with hexagonal cells formed by connected nanowires. The mesophases can be doped by high concentrations of platinum (up to 0.2 M) which leads to relatively large quantities of Pt nanostructures.
Expansion of the surface layers of a facetted hemispherical nanocrystal of Pb is reported at a temperature just below the melting point. Inversion of the coherent x-ray diffraction pattern yields quantitative three-dimensional maps of the deformation of the crystal from its equilibrium lattice spacing. Most of the sur…
Abstract The synthesis and characterization of three highly water‐soluble perylenetetracarboxdiimide (“perylene bisimide”, PBI) dyes 1 and 2b is presented. The water solubility is provided by peripheral dendronization with 1G‐ and 2G‐Newkome dendrons. The aggregation behaviour of these amphiphiles in water and that of…
We compare the near-surface composition and electroactivity of commercial indium tin oxide (ITO) thin films, activated by plasma cleaning or etching with strong haloacids, with ITO films that have been freshly deposited in high vacuum, before and after exposure to the atmosphere or water vapor. Conductive-tip AFM, X-r…
Regulating the twist: Tunable supramolecular chirality is induced in an achiral helical self-assembly (P, M; see picture) by hydrogen-bonded chiral guest molecules (yellow and purple rods). Chiroptical probing of the π-conjugated chromophore reveals the mechanistic pathways of chiral induction. “Majority rules” and “s…
This paper concentrates on a study where finite conductivity corrections are included in the theoretical description of the effects of roughness on the Casimir force. The roughness data were taken from gold films evaporated onto Silicon and polysterene spheres. We conclude that for a detailed comparison with experimen…
Using a one-parameter case as an example, we demonstrate that multicanonical simulations allow for accurate estimates of the residual combinatorial entropy of partially ordered ice. For the considered case corrections to an (approximate) analytical formula are found to be small, never exceeding 0.5%. The method allows…
Protein patterning was carried out using a simple procedure based on photolithography wherein the protein was not subjected to UV irradiation and high temperatures or contacted with denaturing solvents or strongly acidic or basic solutions. Self-assembled monolayers of poly(ethylene glycol) (PEG) on silicon surfaces w…